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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e29c9bebb6edb9bcf2201450f2d016275debfb527252645f3499975a0b084e0' 
  AND token = 'aN5lf2mTd4UokbBwKRqAOJOKwFYueFgIa/78yS2U6W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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