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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02796da7c025d9c0d67e84446112d133d8d4a24d91bf5d3e113643e03ef7753f' 
  AND token = '1085DFY+sMfFENax7x7bQhUd6Xz9450fBfTvVdkd1Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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