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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ac6936238c6c7022bf2e2d5de0661acd52589e1a032ee835a2ec94207fb0459' 
  AND token = 'lTTQROurkIHn5/lLDzyONlQRbGEYsLDipjy90rhyWac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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