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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca776a6c1a4c68b2f9c8b215da881d981523c322eb10a192006743f25e00d27a' 
  AND token = 'HNRgegi9tLkDfJFwhQd0Xx2vkQoKROipRBH4F7wFDU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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