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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbebd278c5ba69b547fb582a185f49da09803dcd1b3ff3915df4cd92f8ddc91f' 
  AND token = 'N0w6ByBdWD92oJde6PVW0y3bQqIUutraarXF/pQ3DoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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