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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f681791becb6ef39cbef9404db8153f68aab3c42a926f7de777a7be58dad3189' 
  AND token = 'jRI+jF+WOSWWk+PxxWCNof2MZLFkaYGxsx86zhqa64U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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