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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '997a52d6cff3a9eca5461ce8c3f2084b35e36d3859f8ca20656ee22098d37311' 
  AND token = 'mkKA7yKY/S/SoAEWhGKy3WZh31copxF1hT+OLadozWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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