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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26baa7afb68f7d925d12304f76967bbf7a775d250a5a8b3ac7a3577c958af6db' 
  AND token = 'CxpmkAQjHlJ+lxLpeu0PsDKi5kjXGwTMJ9auSoJj6wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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