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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6bb5a97007d65f3497b7489a17900b8b5a15da45cc22d9281eaf2b6a0105341b' 
  AND token = 'R7VtSY9z7pULtfToGfBTv4wQNx1t1JLwR9lNCEmhQ88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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