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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4801e44533c142cadee2478f61e54349b90ef7fdf20f2236e37c70ec438a8e5c' 
  AND token = '61bh5leOChSU9e/Jg/5IXrAR303q5Ax1k2qYmsXO1pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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