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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7744a30b8f351d0ab4afa384e0d43821f173ad254f8b7e64164bd3ceb5353cd' 
  AND token = '2bs71IQQwHHg7O9WMPZr8GJCblnyyOWXucMHCZfXGIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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