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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4277173a672d7fd8c0ba6cf41d96a0d194dc323ecba686abf33cc702ea2a39e3' 
  AND token = '2SZYHmS3pEYPlf8jR7JgAC7ympypWb4ze6vO4koN/+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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