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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1172249663efabb7849108aa29ee3ef9caf25d041765e99c18c802f4d10f0031' 
  AND token = 'RFBJ652o1x7nfm9Qt7DTipngF4+kCAFMMESVfv1ZvGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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