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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a315d72383b3d883b242251f6a233f9b0559fcfc13db6a07bd8ea492dab476b' 
  AND token = '2Y0JyDtcXO5slRKyQcalgyCWip1ZLOi5s63reuvPdP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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