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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa113d05d00616b11bb68c2294c8c8135406ccc1092f6eb7dbf455db73085fcc' 
  AND token = 'HxGQ4k4L5ApNOV6h+y0LkgJ0dOPNm28+A1dFaxlo0PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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