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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a84e74205926f7c498f873f87d8ea4dbece53a15c0999d567494635fb9f59c9' 
  AND token = 'vOE1cjir8R+1POsOaipzpkV+9lP6DLprX/1hEym/s7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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