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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '026663273dbd4c9c23393f9c40a7afbbc01aaed948d1177deb3903eea6bb6771' 
  AND token = 'Dm8U7uWQ562UpzuoE0QvhVOQKzPa7uANG4bjyMwrowU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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