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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc15b745b7c651c751818311105b19590a0c121772d38195862553cc3286e171' 
  AND token = '7MwmoNoLSSAuc5/fbJWU4q0xgYc0O4XnFo7iDWqRi8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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