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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c85c23f8baec705d5e7dc1ecd0fce9588ab28c1fa3d6ffa99461566042c2122' 
  AND token = 'wUqumo6MBxBKqCvcn2d6f/sJbElGLdaC9c5DhneN3BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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