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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88aff0c200345972020f6c7cec9060e339991b33040a9667649cb0f13bdda9a4' 
  AND token = '8o065pVA7H2b3qpE+k3OjA1ay0OY+XJAAHg8VIyUNdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}