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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5037e76e88d928457b879999c9135b14c40aff209ccaf8891e749ffdc13f4a80' 
  AND token = 'kQ3+XTdWTikpeHHLhTv0wd9Sn2EpIEZeQh/h77KH0dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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