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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '591a4e51405400d9319286ab32ac12a6a028a82150385cac86b2ca7dc8200465' 
  AND token = '+SN7Q6TdOgW+1WgHll01vzE+3BYzUwN2mSwyyjCuYZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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