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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91d666bb43d6bd6595f377a58b784137be0da2c2e474e7a2f11e43367be90855' 
  AND token = 'rZaQb8mF4vFlrdQOVkzZ+Nt9U4VTjGBnnb+bNOe9GdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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