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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e20bf331b1aff55ce25c05fae56a32ad19b84a4aae53bdb10174a8923ac08710' 
  AND token = 'O245W6aBGRFxUxyy6shffHeigrdu8UvlQm9GD4vS3vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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