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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40d2326af57c5dd61841924e3efe1376e440fcc6ea17569a791fdd6eaed8299a' 
  AND token = 'hxN0ws0zFU3RBNqq3jpnSajMRIqnrlODdWUCeh9ECR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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