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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2125d23b59a64fed1df8690ffd0e7f28d0a7636ce22b93c20973af73f5051651' 
  AND token = '9PMjcQp8RXv92HO1PSyRP8lQsTWnPtJ7ud5/6JSX97w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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