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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d727eea6d3cc0954ec536416e2055fd6b5e3f0122a9f404d1e802a4d97b08ea' 
  AND token = 'x0In3Yew78K8+bJt8PjN6ab14FDvVxPBVMRsqRAdA7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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