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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3fea7bf1ff7a26df2d1cfd5aae39d6a642a2c2506ab5c9eb963149f5df0e7f9' 
  AND token = 'ZJm0fVDL9XjoU3vKxzooczXYvT9t21n1l7Zy6reg/18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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