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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c91e202c18c16409ff2189319134ab9d8b210607cfa52ec9d57617c0db22c19' 
  AND token = '3Xye6Xqtp06KHb1EEcueO6SqT9N7rZxyvs9ebig3IbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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