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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f63091f34a2fcedbe6b476fac6dd239be50d6c1d8c56ff57dd5dc3cd65a40bf5' 
  AND token = 'NfpmTqa8XN5g3Jnl/idu3snRiV54HlYusskhoakd468=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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