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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b50f29b271adc91ab6904d6e2971ee94023c8d90285555c06b6922e101ccf24' 
  AND token = 'doxvDDJ+CLTHT19SqJG34vmPGmH3B+b8si/4qxG85Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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