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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fdf443cf0add1464a78e8b2bf106c1487537939206d6c14a1dbfed1e5804364' 
  AND token = 'HHPo6IxyG6cSgq7o+nQ4dN579k/xZApYMyFDHPeB2Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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