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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd0c1777b120fd989ff4a6f21d41543311c0b145e5ef7e8136f9fab46535324e' 
  AND token = 'FrBNixk9k4b//NWTO4Extpg16nBD93Xyf9jkDfa7Nuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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