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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2437e94ecc9b96730f4dd605b73664e5b271f68049830f2e6a1b482db970ef1c' 
  AND token = '114Sc5ShY80pqXLM3t/DieHXeFRw8yl6i1dZkGqAMi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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