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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4d92729ccf26f62a2007a379a057304459072457fe2cc2e987980cdd9f6fb72' 
  AND token = 'YW8zjhllpVsuHPrlr0HGUTZD9Fr00vJTE5Fox/eSSoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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