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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80c9b2c5698bc7e30a040e0f52d5acc55fea26eb31bb91a5877f84d7c9b9cacc' 
  AND token = 'g/JfbXdq91zHbX00BiztJnWv0LWjs4oDRi6pEzdEGQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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