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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35d54700ec3ce3fabd6cd114c41bfac2886eaad3f86164729c3ec1e07634b6d2' 
  AND token = 'Spif1LVjHes/Ylftj+VCSSBfh16ari51cWcyiqhGcPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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