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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f452b974c1aadda97486d387395b8cab6a09f01ffb0e6b0bfa48b647a708607' 
  AND token = 'arks6rlo4EYO6VnnLEeymp0/zDbUOwmiWtzvq6oznp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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