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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9ce53142204b7cdd3cdfa47ebc7ef664045e7ee46640a865dd4b72919e4c52f' 
  AND token = 'uo1uHgMQ0kupXMBdy6ATJ0X4MjlMlUkW/7qZmPkXejE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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