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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0dba15d3aac50e0a7cd6ac78cfa629657cb7205ca77f6b5fae4741a8e71ae88' 
  AND token = 'Gsw3+CdJIejGnwuEki2fL62bbmt+hQ7IvoUEMQ3TvqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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