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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6d3b029c0047045ef5d7b715fde00b9b1b14739d56bdd4d515dec78bb400997' 
  AND token = 'Asubrp4meZhjc7ir6MaY+B2XuYOTQZC0OQsGPY5qhOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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