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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6a6eac4caa111644aa7a1927860c89a7ce4afaa34dfe07f9c6a72b839a497b1' 
  AND token = 'QIPNN0H5ExiZH8WdpiESZS924n3T8ewAXSwoPu/TKUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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