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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64d9eb5b0bab8aef58d6b4e3746d084b017e61694e144c080ec9af8a2e693f34' 
  AND token = 'S3yddpc53Fbt/v+iqf/19Uyz7/ca26CjPfkqhPg8gHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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