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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b16361b196f3df3a30af63f47dcd5dccfd5dfa1ca55b5177e4fb1e8d82a076e7' 
  AND token = 'zqreI4n926eEHG66qEEbRDVgaL9CHTULouMRwtePetg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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