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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b5a021ec485b0d601e2562d009b3bc44af3fa54d3d62b8a2d5cc95fd8782823' 
  AND token = 't8UOMsSZQmbTTPs4VG7DTXA+9qsOSgUHZp7V+11UA7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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