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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e472ade021daf32a810a0338f59a1dc9cb77f7414801181aed112351d8065549' 
  AND token = 'tMD/RzEtiCHNG+ZPjekC4qQza/QtaFB6fo4Ic1A9hPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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