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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c02d09a4b485bfd4435448c72ed5fee4ae639ed375d43b73e9238ec520c16b8' 
  AND token = 'YTOJL/J6w3bQamUyQiPDco/w15xIeVerX0VxOeQ1ETQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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