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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f23f4c9484b9f84c11b4c65291f51edad3b1ce8c227cd39aa9a947c95a45d10' 
  AND token = 'bYcnFpiN5I2b5JBVWgTpcMQTnjNvRgbC+tcXuCTA3IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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