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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c5aa7a3420e55a2ef4265a8d46ba22cea6981a8743f271173b618abfe8acd94' 
  AND token = 'RYPqkS56Sobkzd9wfqxfI5iHM6Qq4KM2AeowF+SqWBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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