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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f414cac3d5510931ed7171e9445c4875c87376571fcfeef37b0976aab694cfcb' 
  AND token = 'uyce8NfzRSRhA20lwX0SdOzY88C4AUWMGTgWKyycuVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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