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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f61f304a961e2caec4bb6f5850e963d95d49c458d91632ed88c83b9f6df944ca' 
  AND token = 'YJDvS4aJKc7ekYkY4QgjQ1PYT59jq14FjIEBk1yceI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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